Both the Phone calls and Messages are selected by default. If you don’t want to delete phone calls, just uncheck the Phone calls option (see screenshot).

Hit the "Yes". Now you can see a popup. I summarize the popup message here: If your ﻿﻿﻿device version is KitKat or above, then you have to make this app as default messaging app. Making this app as default will allow the app to do this deletion process.

All you have to do is tap OK on this popup and then Yes on the next popup.

That's it. The app will take care of the deletion process.

After the deletion process, make sure to open your messaging app and make it as default.

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